‘U’ Parameters for P3 Primary Element | Siemens 7ML19985AB01

‘U’ PARAMETERS FOR P3 PRIMARY ELEMENT

The number of ‘U’ parameters required varies according to the primary element chosen (P3) and the method of calculation (P4). The OCM-3 prompts the user by displaying the next required parameter, insuring the programming is complete.

The following is a list of the specific primary elements to which the OCM-3 can be applied.

Refer to the page covering your particular application; the rest may be disregarded.

P3	primary element

0exponential device (e.g. proportional, V-notch, Parshall etc)

1BS-3680 Rectangular Flume (ISO 4359)

2BS-3680 Round Nose Horizontal Crest Weir (ISO 4374)

3BS-3680 Trapezoidal Flume (ISO 4359)

4BS-3680 U-throated Flume (ISO 4359)

5BS-3680 Finite Crest Weir (ISO 3846)

6BS-3680 Thin Plate Rectangular Weir (ISO 1438/1)

7BS-3680 Thin Plate V Notch Weir (ISO 1438/1)

8Rectangular Weir (contracted)

9Round Pipe

10Palmer-Bowlus Flume

11H Flume

12Universal Head vs. Flow

13Rectangular Area x Velocity

14Trapezoidal Area x Velocity

15Modified Trapezoidal Area x Velocity

16U-channel Area x Velocity

7ML19985AB01

OCM III

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Siemens 7ML19985AB01 instruction manual ‘U’ Parameters for P3 Primary Element

Contents

Open channel Unit Repair and Excluded Liability Contact Smpi Technical Publications at the following address Table of Contents Operation Start UPGeneral Keypad Initial Start Up Fundamental Checks Maintenance Error Codes 100 Communications 101 7ML19985AB01 Appendices OCM If you want to know about Read Product About thisShort OCM » 20 to 50 C -5 to 122 F Specifications» range 20 or 4-20 mA » resolution IP65 enclosure Programmer » CE *, FM, CSA NRTL/C Cabling Temperature SensorTransducer Output » Belden Communication SoftwareAuxiliary Input Outline and Mounting InstallationInstalling the OCM-3 OCM-3 Layout Customer device System DiagramOCM-3 Ground shield at OCM-3 only Basic Wiring Temperature Sensor Installing the TransducerInstalling the Temperature Sensor Ground shield at OCM-3 only MA Output Relays Synchronization DC Power Power ConnectionsAC Power Disconnect power before installing or replacing the battery Installing the Memory BACK-UP BatteryInstalling the Programmer Communicating VIA Computer Keypad Start UPGeneral Language Initial Start UPOCM-3 is asking which language you prefer to communicate English P0 language English P1 dimensional units Centimeters F13 auto zero calibration 160 Completed 7ML19985AB01 114100 Enter new time 114124-hr. time F5 ddmmyyyy date October 12 Fundamental Checks OCM Security OperationMemory Units Absolute vs. ratiometric Flow CalculationDisplay = constant For battery operation, set display lighting to off or auto Damping » 20 mA For battery operation, have relays energizing on alarmExample For relay » P6 * flow rate Flow rate FAIL-SAFEFlow Rate and Totalizing Logging Capacity Viewing the data log Time and Date TemperatureBlanking Emulation Mode Reset Voltage Input Current Input Flow Velocity InputAuxiliary Head Input As normal 7ML19985AB01 100% head 4 m, enter 5 m Diagnostic AidsDC Output Velocity Security access required‘D’ Parameter Listing Nominal target range OCM Keypad to mA output Enter security code Emulation mode‘F’ Parameter Listing OCM = centimetres ‘P’ Parameter ListingLinear Velocity Gallons Flowrate Volume= absolute = ratiometric Flow rate units = imperial million gallons per day OCM = 4-20 mA = 0-20 mA 7ML19985AB01 OCM OCM Units FixedVariable condition OCM ‘U’ Parameters for P3 Primary Element OCM = constant factor U1 = head U0 = exponent U1 = k factor P4 = 0 onlyReference Typical SHARP-CRESTED Weirs Typical Weir Profiles Khafagi Venturi Typical Parshall Flume Typical Leopold Lagco ‘U’ parameters required ‘U’ parameters calculated BS-3680 Rectangular Flume = crest width = Cv = crest height = Cd = crest length = a BS-3680 Round Nose Horizontal Crest Weir Cv = velocity coefficient ¤ Refer to Operation \ Flow Calculation 7ML19985AB01 BS-3680 Trapezoidal Flume BS-3680 U-Flume, P3 = BS-3680 U-FLUME = crest width = C = crest height = Cp = crest length = head H and p applied to C BS-3680 Finite Crest Weir = gravitational acceleration = Ce x 2⁄3 ⎯⎯√2⎯g x be x he1.5 Where q = flow rate= approach width = Ce = crest width = K b = crest height = crest width He = effective head h + Kh = head Kh = 1 mm BS-3680 Thin Plate Rectangular Weir U0 = notch angle Alpha U1 = Ce BS-3680 Thin Plate V-NOTCH Weir U0 = crest width b Rectangular Weir Contracted Based on the Manning Formula = hydraulic radius = slope of hydraulic gradient Round Pipe U0 = maximum flume width, hmax PALMER-BOWLUS Flume U0 = maximum listed head, hmax Flume Universal Head vs FLOW, P3 = U0 = number of data points n, 4 to Flow, point A17 Head, point A18 Flow, point A13 Head, point A14Flow, point A15 Head, point A16 Flow, point A19 U0 = channel width B U1 = area h Rectangular Area X Velocity = head, cm = flow velocity, cm/sec Trapezoidal Area X Velocity = channel top width, cm = head, cm = channel base width, cm = B b/d Where q = flow rate, l/sFor h ≥ d Modified Trapezoidal Area X Velocity U0 = base diameter D U1 = area h Channel Area x Velocity U0 = conduit diameter U1 = area h Circular Area X Velocity GULL-WING Area X VELOCITY, P3 = Gull Wing Area X Velocity EGG-SHAPED Area X VELOCITY, P3 = EGG-SHAPED Area X Velocity Universal Area X VELOCITY, P3 = Typical open channel A10 = Universal Area X VelocityArea Head OCM Maintenance Error Codes Serial printer Customer’sComputer Protocol for the OCM-3 is as follows Baud rate 102 Bipolar Current DB-9 connectorDB-25 connector Refer to Cvcc Instruction 104 DateP35 = 7, print interval set for 7 minutes 105 Utilities Software Programmer Remote OCM-3 programmingRemote OCM-3 display Local display 106 00.000000 99.12399.123000 7ML19985AB01 Typical OCM-3Display value 107 # = 0 through Content of P5 Response 109 Start data log down loadStop data log down load Cable DB-25 connector 7ML19985AB01Standard modem Computer Telephone lines Remote modem 111 Establishing CommunicationConnect Ending Communication 112 Rev